Warning !

article source: wikihow.com

•     When using a digital camera avoid deleting pictures using your PC and a card reader. Instead copy the pictures you need and once done delete the pictures using your camera. Some older memory cards become unreadable if formated/deleted via a PC. This has however become less common as manufactures use better standards of manufacturing and more compatibility became available. 
•     When you have your equipment in your car try keeping it in the boot (trunk) of your car to keep it hidden from would be robbers. Alternatively keep it covered with a bath towel or something similar.
•     A good way to get your equipment stolen is to carry your camera in a custom photo carrier emblazoned with, e.g. "NIKON" or "CANON" - far better to carry your camera in an old diaper bag, backpack, etc. to avoid tipping off thieves. www.Stuffbak.com sells economical, durable, numbered labels which allow honest finders of your equipment the means to return your lost valuables for a reward, which you can offer via their online or phone retrieval services.
•    If you are planing to buy second hand equipment make sure it is not stolen. A good sign of original ownership is the sales receipt. Some other signs to point to legitimate goods are chargers, user manuals cables etc. If these are not available there is a good chance that the items are stolen. This is not always the case though.